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[23.128.96.18]) by mx.google.com with ESMTP id 2si7809288iob.47.2021.09.13.21.34.37; Mon, 13 Sep 2021 21:34:48 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20210112 header.b="Wz8/qbTP"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233376AbhINEeB (ORCPT + 99 others); Tue, 14 Sep 2021 00:34:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41060 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231393AbhINEeA (ORCPT ); Tue, 14 Sep 2021 00:34:00 -0400 Received: from mail-lj1-x22d.google.com (mail-lj1-x22d.google.com [IPv6:2a00:1450:4864:20::22d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF149C061574 for ; Mon, 13 Sep 2021 21:32:38 -0700 (PDT) Received: by mail-lj1-x22d.google.com with SMTP id i28so21294411ljm.7 for ; Mon, 13 Sep 2021 21:32:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=fu4lIl+FKgt34SvsZzswMOLfBBmVaqouMxJqzvs5GUE=; b=Wz8/qbTPuO2gFsebTp8dF07QwNkcGKHJMIVgEfNxylqPVZk6OBBEkaVAdxFl12egu7 l97RUWL/RGR8c934GwssB4/036sjsHpT9g0uqhwaOqSjYuXOsqG1yftRdoOu/8BIc9cl 6voG47yQxfvp9VzEVI9Iif5Icr86qsK7yGWbgCOsrBwFx2Jr+WK4n9+Syk4/kwti/G0V nM5qOvg8C/2cJB40l7jsLaIeAnGw2ZFv+dElbWu8D9BO2Gt6R30tVUrztrdx7+U1Yux6 xFN2S8CNPAjBD2AY+FHArieeB3XWjHrOCCqrKRk/SSiCyDCnoxoBZeRQWTVCBTZLYVi8 dT9Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=fu4lIl+FKgt34SvsZzswMOLfBBmVaqouMxJqzvs5GUE=; b=FAuDRg7XZOWlLCo9alGcJHPliltstvMPeG34XLZakgDckNCDCrwUAzZ/VSipTAjc51 1aWKJFFV42UQDyN7TpgEirkqfuEAnYVMy5AhPgVQGNpkuOfsC1fPsdyrfMULXYl2XKqg n9RsVijM7uJoT489dMV/xDDse2Byw/M/3RRyXxU7Y0z7/4NXU1p//i1U+HqIi1qtRIcg 7CFyvn9ZtUJuC3a+MUU85mbPIRbxujaWacDNEH2UwQsgFrstVw6hfHnAywj3BYy8sox/ xkGVpCXWRiY0q6Xy5azWo06Qv/KR61PGhcyplT4QlvWN+DUhrp1Dd3B8+6wEP6zny3mX 09nw== X-Gm-Message-State: AOAM531yKl2w4hEBTPiG2ignilDP6wegFcsHnsXiWTkcv3KOOMbC7gGH s92QUS9vRD4YDb3W+Av4CzvY5UPR9tepkJVx8FCMCw== X-Received: by 2002:a05:651c:113b:: with SMTP id e27mr13609792ljo.6.1631593956911; Mon, 13 Sep 2021 21:32:36 -0700 (PDT) MIME-Version: 1.0 References: <90e254df-0dfe-f080-011e-b7c53ee7fd20@virtuozzo.com> In-Reply-To: From: Shakeel Butt Date: Mon, 13 Sep 2021 21:32:25 -0700 Message-ID: Subject: Re: [PATCH] ipc: remove memcg accounting for sops objects in do_semtimedop() To: Michal Hocko Cc: Vasily Averin , Andrew Morton , Linus Torvalds , LKML , Johannes Weiner , kernel@openvz.org, Cgroups Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 13, 2021 at 1:37 AM Michal Hocko wrote: > [...] > > However Shakeel Butt pointed that there are much more popular objects > > with the same life time and similar memory consumption, the accounting > > of which was decided to be rejected for performance reasons. > > Is there any measurable performance impact in this particular case? > I don't think there was any regression report or any performance evaluation. Linus raised the concern on the potential performance impact. I suggested to backoff for this allocation for now and revisit again once we have improved the memcg accounting for kernel memory.